One engine manufacturer recommends heavy fuel oil should not be heated above 80℃ to 95℃ (176 ℉ TO 203℉) before purificationThis upper limit should be observed to ensure against（）
- Aflattening of the bowl neoprene O-rings
- Boperation within the explosive rang of the fuel
- Cexcessive purifier operating pressures
- Dexcessive oil viscosity